Update dependency phpunit/phpunit to v12

| datasource | package         | from    | to     |
| ---------- | --------------- | ------- | ------ |
| packagist  | phpunit/phpunit | 11.5.46 | 12.5.4 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

composer.json

@@ -29,7 +29,7 @@
     "phpbench/phpbench": "^1.2.15",
     "phpstan/phpstan": "^2.1.32",
     "phpstan/phpstan-phpunit": "^2.0.8",
-    "phpunit/phpunit": "^11.5.3",
+    "phpunit/phpunit": "^12.0.0",
     "symfony/var-dumper": "^5.4.29 || ^6.4.0 || ^7.0.0 || ^8.0.0"
   },
   "config": {